Anarchist Extremists: Antifa

Anti-fascist groups, or “Antifa,” are a subset of the anarchist movement and focus on issues involving racism, sexism, and anti-Semitism, as well as other perceived injustices.

Antifa: Inciting Violence Toward Far-Right Extremists

Violent confrontations between Antifa members and white supremacists—as well as militia groups—will likely continue because of ideological differences and Antifa’s ability to organize on social media. In the past year, Antifa groups have become active across the United States, employing a variety of methods to disrupt demonstrations.  

https://www.njhomelandsecurity.gov/analysis/anarchist-extremists-antifa?rq=antifa